261109039 has 4 divisors (see below), whose sum is σ = 274851640. Its totient is φ = 247366440.

The previous prime is 261109031. The next prime is 261109067. The reversal of 261109039 is 930901162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261109039 - 2³ = 261109031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261109039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261109031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6871272 + ... + 6871309.

It is an arithmetic number, because the mean of its divisors is an integer number (68712910).

Almost surely, 2^261109039 is an apocalyptic number.

261109039 is a deficient number, since it is larger than the sum of its proper divisors (13742601).

261109039 is a wasteful number, since it uses less digits than its factorization.

261109039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13742600.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 261109039 is about 16158.8687413445. The cubic root of 261109039 is about 639.1566357213.

The spelling of 261109039 in words is "two hundred sixty-one million, one hundred nine thousand, thirty-nine".